Abstract
Plants growing on NO3- differ in the proportion of NO3- reduced in their roots and leaves. Using a version of a two-compartment, two-resource plant growth simulation model, the possible effects of changing the N assimilation site on plant growth were explored. Subsequently, using an experimental system designed to vary the site of NO3- reduction; chimeras (reciprocal grafts) of Pisum sativum var. Juneau and its mutant, A317, deficient in nitrate reductase. Plant growth and N metabolism at varying NO3- levels were examined in a hydroponic system. In what is thought to be the first direct plant manipulation of this kind, total dry weight, root:shoot ratio, total N and NO3- concentrations, in vitro nitrate reductase activity, NO3- in xylem exudates, and leaf chlorophyll content were compared. It was found that changing the location of nitrate reduction did not change growth significantly and caused only subtle changes in N concentration. These indifferences occurred in spite of marked changes in growth associated with NO3- availability and useability. To achieve this kind of plasticity the plants must have dramatically altered the flow and storage of NO3- and reduced N. The results are compared with existing views of biomass partitioning and regulation of N assimilation.
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Claims 4
Claim · model-written summary
Changing the site of nitrate reduction did not change growth significantly in pea.
- Taxon
- Pisum sativum
Lathyrus oleraceuse2 - Treatment
- changing the location of nitrate reductione1
- Outcome
- growthe1
- Direction
- did not changee1
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“It was found that changing the location of nitrate reduction did not change growth significantly and caused only subtle changes in N concentration”
e2“chimeras (reciprocal grafts) of Pisum sativum var. Juneau and its mutant, A317, deficient in nitrate reductase”
Claim · model-written summary
Changing the site of nitrate reduction caused only subtle changes in N concentration in pea.
- Taxon
- Pisum sativumLathyrus oleraceuse2
- Treatment
- changing the location of nitrate reductione1
- Outcome
- N concentratione1
Not reportedComparatorDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e1“It was found that changing the location of nitrate reduction did not change growth significantly and caused only subtle changes in N concentration”
e2“chimeras (reciprocal grafts) of Pisum sativum var. Juneau and its mutant, A317, deficient in nitrate reductase”
Claim · model-written summary
Marked changes in pea growth were associated with NO3- availability and useability.
- Taxon
- Pisum sativumLathyrus oleraceuse2
- Treatment
- NO3- availabilitye3
- Outcome
- growthe3
Not reportedDirection
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“chimeras (reciprocal grafts) of Pisum sativum var. Juneau and its mutant, A317, deficient in nitrate reductase”
e3“These indifferences occurred in spite of marked changes in growth associated with NO3- availability and useability”
Claim · model-written summary
Pea plants must have dramatically altered the flow and storage of NO3- and reduced N to achieve this plasticity.
- Taxon
- Pisum sativumLathyrus oleraceuse2
- Outcome
- flow and storage of NO3- and reduced Ne4
- Qualifier
- To achieve this kind of plasticitye4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e2“chimeras (reciprocal grafts) of Pisum sativum var. Juneau and its mutant, A317, deficient in nitrate reductase”
e4“To achieve this kind of plasticity the plants must have dramatically altered the flow and storage of NO3- and reduced N”
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